diff --git a/.travis.yml b/.travis.yml
index 21610dc..a9ab909 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: swift
-osx_image: xcode10.2
+osx_image: xcode11.5
 xcode_destination: platform=macOS
 xcode_workspace: Harptos.xcworkspace
 xcode_scheme: "Harptos macOS"
diff --git a/Makefile b/Makefile
index ec9a414..11fbdb8 100644
--- a/Makefile
+++ b/Makefile
@@ -2,11 +2,11 @@
 
 test: 
 	# test project	
-	set -o pipefail && xcodebuild test -scheme "Harptos macOS" -destination "platform=macOS,arch=x86_64" OBJROOT="$(PWD)/build" -sdk "macosx10.14" | xcpretty
+	set -o pipefail && xcodebuild test -scheme "Harptos macOS" -destination "platform=macOS,arch=x86_64" OBJROOT="$(PWD)/build" -sdk "macosx10.15" | xcpretty
 
 build:
 	# build project
-	set -o pipefail && xcodebuild build -scheme "Harptos macOS" -destination "platform=macOS,arch=x86_64" OBJROOT="$(PWD)/build" -sdk "macosx10.14" | xcpretty
+	set -o pipefail && xcodebuild build -scheme "Harptos macOS" -destination "platform=macOS,arch=x86_64" OBJROOT="$(PWD)/build" -sdk "macosx10.15" | xcpretty
 
 clean:
 	# clean project